Monroe County, US
Sand Key Light is a lighthouse 6 nautical miles (11 km; 6.9 mi) southwest of Key West, Florida, between Sand Key Channel and Rock Key Channel, two of the channels into Key West, on a reef intermittently covered by sand. At times the key has been substantial enough to have trees, and in 1900 nine to
twelve thousand terns nested on the island. At other times the island has been washed away completely. The light marks the southernmost point of the Hawk Channel passage along the Florida Keys.
Listen to the audio guide for Sand Key Light Free on WIP — starts by itself when you arrive, even with the screen off